Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b72fae91781d84c…

MALICIOUS

PDF

88.1 KB Created: 2021-09-19 18:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6ca06eee7f251e5812e19641182199c SHA-1: 4a579e83a0fa9e02c35c52de4be7185606fc3f5c SHA-256: 5b72fae91781d84c4e2e89e846d6daba0127a003ba6217d121f8e0ca1ae1e68a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The PDF structure and embedded links indicate an attempt to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://rtvpuls.com/ckfinder/userfiles/files/13207668795.pdf In PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/wopojorewatitenixanes.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/vomekasozugaw.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142f1cb3a743---8891437044.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/gosimusefa.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/34338328753.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/56407849578.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146434f14b1b---vupidizipefawulevope.pdfIn PDF document text
    • https://morabia.fi/images/file/578277932.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/13721304959.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370c8f603f4---fegonaxirafuvevali.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/18775929534.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6be800c46---zezusulavemekanovix.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/63248736719.pdfIn PDF document text
    • http://vucert.vn/uploads/files/70156059464.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090408483785632.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/81913440228.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/bujejerewej.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbafd9e84---lofolukibefezotag.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/rupem.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/vozipigisoziwaweves.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/febalumolodozagurav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=retrieve+files+from+android+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 18592 bytes
SHA-256: b44a1432a3122e7c9de67066e0d1d576110bd09cd367b00219833a814b01e337
font_01_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 10876 bytes
SHA-256: e50f987cddb865ea5592e3cb5aa184de2b47491b3223cce2fdace4aa8d00c601
font_02_sfnt_off00013a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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